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How do you define the extended mass for a valve?

How do you define the extended mass for a valve?

(OP)
For seismic qualification of valves, a static side load test is performed on a valve but I am trying to find the definition of the extended mass of a valve, if someone can please help. The valve I am dealing with is a manual globe valve with bellows seal.

RE: How do you define the extended mass for a valve?

Any attachments to the valve would generally fall under the definition of an extended structure/mass and typically consist of items necessary for the valve to perform it's safety-related function (solenoids, pilot operators, switches).

If it’s a required active valve, it’s evaluated to ensure operability after an SSE…if it’s not required to function after an SSE, it’s evaluated to ensure only structural integrity to ensure it does not interact/cause failure of a safety-related component.

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